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Starting Systems

is 1 ounce. The motor must be 8.5mm
with no gearing and be direct drive only.

The maximum propeller diameter is 2. 7

inches. The maximum battery size is a
one-cell 160 mAh battery. The flight
should have a 20-second motor run, and
a “max flight” is 90 seconds. Flyoffs use
a 10-second motor run and 120-second-
maximum flight.

For more information about E- 20

airplanes and the BSD Micro RC E- 20

timer/DT, see the “Sources.”

Curtis Hyman sent in some photos of
his micro NutBall. Curtis modeled the
airplane after an 8-inch wingspan FF
version that his father built in 1982. He
found the unique airplane in his father’s
basement and stated that building his
own version of the aircraft allowed him
to reminisce with memories of his dad,
and connect with his uniqueness.

MICRO-FLYING

The three-channel RC model is
constructed from foam and carbon-fiber
rod. It spans 11 inches, and uses a 7mm
geared motor with a 250 mAh LiPo
battery cell.

Curtis said that the model cruises
smoothly at 45% throttle, is highly
maneuverable, and slows enough for
easy Figure Eight turns.